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Photosystem II core phosphorylation and photosynthetic acclimation require two different protein kinases

机译：光系统II核心的磷酸化和光合适应需要两种不同的蛋白激酶

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摘要

Illumination changes elicit modifications of thylakoid proteins and reorganization, of the photosynthetic machinery. This involves, in the short term, phosphorylation of photosystem II (PSII) and light-harvesting (LHCII) proteins. PSII phosphorylation is thought to be relevant for PSII turnover, whereas LHCII phosphorylation is associated with the relocation of LHCII and the redistribution of excitation energy (state transitions) between photosystems. In the long term, imbalances in energy distribution between photosystems are counteracted by adjusting photosystem stoichiometry. In the green alga Chlamydomonas and the plant Arabidopsis, state transitions require the ortho-logous protein kinases STT7 and STN7, respectively. Here we show that in Arabidopsis a second protein kinase, STN8, is required for the quantitative phosphorylation of PSII core proteins. However, PSII activity under high-intensity light is affected only slightly in stn8 mutants, and D1 turnover is indistinguishable from the wild type, implying that reversible protein phosphorylation is not essential for PSII repair. Acclimation to changes in light quality is defective in stn7 but not in stn8 mutants, indicating that short-term and long-term photosynthetic adaptations are coupled. Therefore the phosphorylation of LHCII, or of an unknown substrate of STN7, is also crucial for the control of photosynthetic gene expression.
机译：光照变化引起类囊体蛋白的修饰和光合作用机制的重组。在短期内，这涉及光系统II（PSII）和光捕获（LHCII）蛋白的磷酸化。 PSII磷酸化被认为与PSII转换有关，而LHCII磷酸化与LHCII的重新定位和光系统之间激发能的重新分布（状态转换）有关。从长远来看，通过调节光化学计量比可以消除光系统之间能量分配的不平衡。在绿藻衣藻和拟南芥植物中，状态转换分别需要直系同源蛋白激酶STT7和STN7。在这里，我们显示在拟南芥中，第二个蛋白激酶STN8是PSII核心蛋白定量磷酸化所必需的。但是，在stn8突变体中，高强度光下的PSII活性仅受到轻微影响，并且D1周转率与野生型没有区别，这意味着可逆的蛋白质磷酸化对于PSII修复不是必需的。适应光质量的变化在stn7中是有缺陷的，但在stn8突变体中没有，这表明短期和长期的光合适应是耦合的。因此，LHCII或STN7未知底物的磷酸化对于控制光合作用基因的表达也至关重要。

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